Pain response of resistance training of the paravertebral musculature under radiotherapy in patients with spinal bone metastases: a randomized trial - Rief, Harald; Debus, Jürgen; Welzel, Thomas; Omlor, Georg; Akbar, Michael; Bruckner, Thomas; Rieken, Stefan; Häfner, Matthias; Schlampp, Ingmar; Gioules, Alexandros (BMC cancer, 2014)